<template>
  <el-table :data="formatData" :row-style="showRow" v-bind="$attrs" row-key="id">
    <el-table-column v-if="bIndex" type="index" label="序号" align="center" width="50"></el-table-column>
    <el-table-column
      v-for="(column, index) in columns"
      :key="column.value"
      :label="column.text"
      :width="column.width"
    >
      <template slot-scope="scope">
        <span v-if="index != 0"></span>
        <span v-else v-for="space in scope.row._level" class="ms-tree-space" :key="space"></span>
        <span
          class="tree-ctrl"
          v-if="iconShow(index,scope.row)"
          @click="toggleExpanded(scope.$index)"
        >
          <!-- <i v-if="!scope.row._expanded" class="reduce-icon"></i>
          <i v-else class="expand-icon"></i>-->
          <i class="folder-icon"></i>
        </span>
        <span class="tree-ctrl" v-else-if="index === 0">
          <i class="file-icon"></i>
        </span>
        {{scope.row[column.value]}}
      </template>
    </el-table-column>
    <el-table-column v-if="bSelection" type="selection" align="center" width="50"></el-table-column>
  </el-table>
</template>

<script>
import treeToArray from "./eval";
export default {
  name: "treeTable",
  props: {
    data: {
      type: [Array, Object],
      required: true
    },
    columns: {
      type: Array,
      default: () => []
    },
    bIndex: {
      type: Boolean,
      default: false
    },
    bSelection: {
      type: Boolean,
      default: false
    },
    evalFunc: Function,
    evalArgs: Array,
    expandAll: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    // 格式化数据源
    formatData: function() {
      let tmp;
      if (!Array.isArray(this.data)) {
        tmp = [this.data];
      } else {
        tmp = this.data;
      }
      const func = this.evalFunc || treeToArray;
      const args = this.evalArgs
        ? Array.concat([tmp, this.expandAll], this.evalArgs)
        : [tmp, this.expandAll];
      return func.apply(null, args);
    }
  },
  methods: {
    showRow: function(row) {
      const show = row.row.parent
        ? row.row.parent._expanded && row.row.parent._show
        : true;
      row.row._show = show;
      return show
        ? "animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;"
        : "display:none;";
    },
    // 切换下级是否展开
    toggleExpanded: function(trIndex) {
      const record = this.formatData[trIndex];
      record._expanded = !record._expanded;
    },
    // 图标显示
    iconShow(index, record) {
      return index === 0 && record.children && record.children.length > 0;
    }
  }
};
</script>
<style rel="stylesheet/css">
@keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@-webkit-keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
$color-blue: #2196f3;
$space-width: 16px;
.ms-tree-space {
  position: relative;
  top: 1px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  &::before {
    content: "";
  }
}
.processContainer {
  width: 100%;
  height: 100%;
}
table td {
  line-height: 26px;
}
// .el-table .cell .el-icon {
//   margin-top: -2px;
//   background: red;
// }
.tree-ctrl {
  position: relative;
  cursor: pointer;
  color: $color-blue;
  margin-left: -$space-width;
  vertical-align: middle;
}
.expand-icon {
  position: relative;
  top: 2px;
  display: inline-block;
  line-height: 1;
  width: $space-width;
  height: 14px;
  background-image: url(../../../../../static/resources/images/expand.png);
  background-size: 100% 100%;
}
.reduce-icon {
  position: relative;
  top: 2px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  background-image: url(../../../../../static/resources/images/reduce.png);
  background-size: 100% 100%;
}
.folder-icon {
  position: relative;
  top: 2px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  background-image: url(../../../../../static/resources/images/folder.png);
  background-size: 100% 100%;
}
.file-icon {
  position: relative;
  top: 2px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: $space-width;
  height: 14px;
  background-image: url(../../../../../static/resources/images/file.png);
  background-size: 100% 100%;
}
</style>